1 /* vi: set sw=4 ts=4: */
3 * Gzip implementation for busybox
5 * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
7 * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
8 * based on gzip sources
10 * Adjusted further by Erik Andersen <andersee@debian.org> to support files as
11 * well as stdin/stdout, and to generally behave itself wrt command line
14 * General cleanup to better adhere to the style guide and make use of standard
15 * busybox functions by Glenn McGrath <bug1@optushome.com.au>
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2 of the License, or
20 * (at your option) any later version.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
33 * Copyright (C) 1992-1993 Jean-loup Gailly
34 * The unzip code was written and put in the public domain by Mark Adler.
35 * Portions of the lzw code are derived from the public domain 'compress'
36 * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
37 * Ken Turkowski, Dave Mack and Peter Jannesen.
39 * See the license_msg below and the file COPYING for the software license.
40 * See the file algorithm.doc for the compression algorithms and file formats.
44 static char *license_msg[] = {
45 " Copyright (C) 1992-1993 Jean-loup Gailly",
46 " This program is free software; you can redistribute it and/or modify",
47 " it under the terms of the GNU General Public License as published by",
48 " the Free Software Foundation; either version 2, or (at your option)",
49 " any later version.",
51 " This program is distributed in the hope that it will be useful,",
52 " but WITHOUT ANY WARRANTY; without even the implied warranty of",
53 " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
54 " GNU General Public License for more details.",
56 " You should have received a copy of the GNU General Public License",
57 " along with this program; if not, write to the Free Software",
58 " Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
69 const int gunzip_to_stdout = 1;
70 const int gunzip_force = 2;
71 const int gunzip_test = 4;
72 const int gunzip_verbose = 8;
74 static int gunzip_file (const char *path, int flags)
76 FILE *in_file, *out_file;
78 const char *delete_path;
79 char *out_path = NULL;
81 if (path == NULL || strcmp (path, "-") == 0) {
83 flags |= gunzip_to_stdout;
85 if ((in_file = wfopen(path, "r")) == NULL)
88 if (flags & gunzip_verbose) {
89 fprintf(stderr, "%s:\t", path);
92 /* set the buffer size */
93 setvbuf(in_file, NULL, _IOFBF, 0x8000);
95 /* Get the time stamp on the input file. */
96 if (stat(path, &stat_buf) < 0) {
97 error_msg_and_die("Couldn't stat file %s", path);
101 /* Check that the input is sane. */
102 if (isatty(fileno(in_file)) && (flags & gunzip_force) == 0)
103 error_msg_and_die("compressed data not read from terminal. Use -f to force it.");
105 /* Set output filename and number */
106 if (flags & gunzip_test) {
107 out_file = xfopen("/dev/null", "w"); /* why does test use filenum 2 ? */
108 } else if (flags & gunzip_to_stdout) {
112 int length = strlen(path);
114 extension = strrchr(path, '.');
115 if (extension && strcmp(extension, ".gz") == 0) {
117 } else if (extension && strcmp(extension, ".tgz") == 0) {
120 error_msg_and_die("Invalid extension");
122 out_path = (char *) xcalloc(sizeof(char), length + 1);
123 strncpy(out_path, path, length);
125 /* Open output file */
126 out_file = xfopen(out_path, "w");
128 /* Set permissions on the file */
129 chmod(out_path, stat_buf.st_mode);
132 /* do the decompression, and cleanup */
133 if (unzip(in_file, out_file) == 0) {
134 /* Success, remove .gz file */
136 if (flags & gunzip_verbose) {
137 fprintf(stderr, "OK\n");
140 /* remove failed attempt */
141 delete_path = out_path;
147 if (delete_path && !(flags & gunzip_test)) {
148 if (unlink(delete_path) < 0) {
149 error_msg_and_die("Couldn't remove %s", delete_path);
158 extern int gunzip_main(int argc, char **argv)
162 int status = EXIT_SUCCESS;
164 /* if called as zcat */
165 if (strcmp(applet_name, "zcat") == 0)
166 flags |= gunzip_to_stdout;
168 while ((opt = getopt(argc, argv, "ctfhdqv")) != -1) {
171 flags |= gunzip_to_stdout;
174 flags |= gunzip_force;
177 flags |= gunzip_test;
180 flags |= gunzip_verbose;
182 case 'd': /* Used to convert gzip to gunzip. */
185 error_msg("-q option not supported, ignored");
189 show_usage(); /* exit's inside usage */
193 if (optind == argc) {
194 if (gunzip_file (NULL, flags) < 0)
195 status = EXIT_FAILURE;
197 for (i = optind; i < argc; i++)
198 if (gunzip_file (argv[i], flags) < 0)
199 status = EXIT_FAILURE;